(19)

(11)

EP 2 831 512 A2

(12)

(88) Date of publication A3: 21.11.2013 (43) Date of publication: 04.02.2015 Bulletin 2015/06 (21) Application number: 13724327.5 (22) Date of filing: 20.03.2013

(51) International Patent Classification (IPC):  F24F 3/16(2006.01) F24F 9/00(2006.01) A61G 13/10(2006.01) F24F 13/06(2006.01) (86) International application number: PCT/GB2013/050724 (87) International publication number: WO 2013/144582 (03.10.2013 Gazette 2013/40)

(84) Designated Contracting States: AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR Designated Extension States: BA ME (30) Priority: 29.03.2012 GB 201205557 (71) Applicant: Howorth Air Technology Limited Farnworth, Bolton BL4 7LZ (GB)	(72) Inventor: BROMLEY, Graham Farnworth BL4 7LZ (GB) (74) Representative: Hutter, Anton et al Venner Shipley LLP 200 Aldersgate London EC1A 4HD London EC1A 4HD (GB)